It's generally accepted that you shouldn't whine on Facebook or Twitter. No post-breakup screeds (or song quotes), no political low blows, nor complaints about work. Except, now, for that last one. Recent rulings by the National Labor Relations Board, the friendly federal overseers of lawful labor, have said that you can complain about your boss online without fear of getting fired. But it's not a sure shot. So here are four tips for how to do it right:

No threats. Calling your supervisor a "scumbag" to your co-workers? Cool, if not very understated ("the Board has found more egregious name-calling protected"). Saying you're going to go into the office and smack that piece of shit until he's a pile of tears on the ground? Not such a good idea.

Have some backup. If your boss is said "piece of shit," you've got to have been talking with your work brethren about what's going on and what's wrong. Even better: Form your complaint in question form, to engage something of constructive feedback from co-workers: "Anybody else feel like so-and-so is a piece of shit?"

Have an angle. You've got to be complaining about something. What'd your boss do wrong and how'd it screw you over? Don't just post pictures of overcooked hot dogs at a company event with a brilliantly snide comment. Do so because you and your coworkers (remember: backup) are getting gipped out of commission cash.